Hand-operated high pressure grease gun



H, KREIDEL HAND OPERATED HIGH PRESSURE GREASE GUN Feb. 6, 1934.

Filed Dec. 19, 1951 to a bayonet-joint.

Patented Feb. 6, 1934 UNITED STATES HAND-OPERATED HIGH PRESSURE GREASE GUN Hans Kreidel, Wiesbaden, Germany Application December 19, 1931, Serial No.

582,166, and in Germany March 27, 1931 2 Claims.

The invention relates to a hand-operated highpressure grease gun in which the high-pressure piston is detachably fitted to the inner wall of the grease receptacle by means of a joint similar This kind of attachment allows of inserting and withdrawing the highpressure piston together with the high-pressure cylinder through the rear part of the grease receptacle and provides a quick and easy dismantling and subsequent reassembly of the complete pump without the aid of a special tool. No parts are assembled by screwing and all parts closely fit into one another which constitutes a great advantage with regard to simplicity and reduction of cost in manufacture.

The front part of the grease receptacle is given the form of a neck and serves as a guide for the high-pressure cylinder which is slidable therein. The high pressure-piston is fitted to a sheet metal stamping which forms a support with several arms so as to provide ample free passage from the grease receptacle to the high-pressure pump part ensuring an unobstructed flow of the grease and a reliable operation of the pump unit even if embodied in relatively small grease guns.

The accompanying drawing shows one way of carrying the invention into efiect.

Fig. 1 shows the pump in elevation;

Fig. 2 shows a longitudinal section of the pump;

Fig. 3 shows a cross section of the storage container taken on line AB of Fig. 1;

Fig. 4 shows a cross section of the storage container and high pressure piston, seen from the front end of the pump, and

Fig. 5 shows the high pressure piston with its supporting spider in elevation.

The high-pressure cylinder 0 moves in the front or neck part b of the grease receptacle a so that its end d of increased diameter comes to rest against the inner rim of the neck part b. The interior of the high-pressure cylinder 0 contains in the well known manner the packing e and the safety valve consisting of the ball f and its spring g. The high-pressure piston h is fitted to a support 2' having several, in this case three, radial arms. Stops 7c are arranged on the inner wall of the grease receptacle and correspond in number with the number of arms of the said support i. In the example illustrated in the drawing the stops are formed by inwardly pressed portions of the receptacle wall. The coiled spring I rests with its upper end on the enlarged part of the high-pressure cylinder 0 and with its lower end against the star-form support 2' of the high-pressure piston h, the three arms of the support i being thus pressed against the stops it of the grease receptacle. The arms of the spider support i are trough-shaped or may be formed in any other suitable section which will assure ample rigidity against bending stresses. The ends of thearms are preferably concave in cross section so as to be engageable with the inwardly projecting stops k, so that the spring Z will, by pressing the spider 2' against the stops 7c, firmly hold the latter in position so that the plunger or piston h will be in alignment with the axis of the cylinder 0.

The atmospheric pressure operated follower piston has been designated by m and the pump cover by 0.

Disassembling of the gun is effected by taking off the cover 0 and by withdrawing the follower piston m. The high-pressure piston support 2' is thereupon depressed by means of a suitable tool or the shaft of a hammer so as to remove it from the stops k. A subsequent slight turning of this high-pressure piston it will get it entirely free from the stops it, and the highpressure numping device consisting of the highpressure piston h with support 2, the coiled spring Z and the high-pressure cylinder 0 can thereupon readily be removed from the grease receptacle a. Reassembling is effected in the opposite way.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a high pressure grease gun of the push operated type, the combination of a barrel having a guide at one end thereof, a high pressure cylinder reciprocable in said guide, a plurality of spaced stops formed in said barrel, a spider having parts thereof cooperable with said stops, a plunger for said high pressure cylinder and carried by said spider, and a spring compressed between said spider and said high pressure cylinder and operative to hold said spider against said stops and to hold said cylinder outwardly.

2. A high pressure grease gun of the push operated type, comprising a barrel having an integral tubular guide formed at one end. thereof, a high pressure cylinder and nozzle part reciprocable in said guide and having means engageable with said barrel to limit the outward movement of said part, a plurality of spaced stops formed within the barrel near the guide portion thereof, a member having parts inter-engageable with said stops so as to be positioned thereby, a plunger carried by said member, and a spring compressed between said nozzle part and said member and operable to hold the latter against said stops and to hold said nozzle part in its outermost position.

HANS KREIDEL. 

